Originally Posted by
Less Hair
It has more like 747-400 engines. Uprated.
Not quite. AF1 is equipped with CF6-80C2 engines, but they are the 'PMC' version, not FADEC. There were (IIRC) nine 747s built with the CF6-80C PMC engines - seven 747-300s (i.e. stretched upper deck), and two 747-200s that became the AF1 aircraft (the non-FADEC 747/CF6-80C2 wasn't exactly a big money maker for Boeing
).
But other than the somewhat unusual engine configuration, Willow is correct, the AF1 aircraft started life as pretty much stock standard 747-200s. They were then flown to Wichita (pretty much sans interiors) where they were converted to the AF1 configuration.